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      <h1 class="post-title">web 服务构建 - gRPC</h1>

      <div class="post-meta">
        <span class="post-time"> 0001-01-01 </span>
        
        
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    <div class="post-toc" id="post-toc">
  <h2 class="post-toc-title"></h2>
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  <ul>
    <li><a href="#golang-web-服务构建---grpc">Golang web 服务构建 - gRPC</a>
      <ul>
        <li><a href="#grpc-">gRPC ？</a></li>
        <li><a href="#hello-world">hello world</a>
          <ul>
            <li><a href="#1准备工作">1、准备工作</a></li>
            <li><a href="#2案例体验">2、案例体验</a></li>
            <li><a href="#3-编写自己的-hello-world">3. 编写自己的 hello world</a></li>
            <li><a href="#33-产生代码">3.3 产生代码</a></li>
            <li><a href="#34-修改应用程序">3.4 修改应用程序</a></li>
          </ul>
        </li>
      </ul>
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    <div class="post-content">
      <h1 id="golang-web-服务构建---grpc">Golang web 服务构建 - gRPC</h1>
<p>{:.no_toc}</p>
<p>随着技术的发展，人们也不再认为 REST 是构建 web 服务的唯一选择。RPC 风格、 REST 风格、 GraphQL API 的 web 服务将在很长一段时间内共存（应该是各自取长补短，各守一片天地，甚至在同一应用中，不同风格 API 混搭的局面）。本文选取 gRPC、swagger、GraphQL作为服务 API 描述标准，简单介绍三种 API 的服务构建（go 语言）。</p>
<h2 id="grpc-">gRPC ？</h2>
<h2 id="hello-world">hello world</h2>
<p>gRPC 官当文档 <a href="https://grpc.io/docs/quickstart">hello world</a> 质量非常好，只是因为“墙”和版本更新，网上许多博客可能会困惑你。目前最新版本 Protocol Buffers v3。</p>
<h3 id="1准备工作">1、准备工作</h3>
<p><strong>1.1 检查 go 版本</strong></p>
<p>gRPC 要求 go 1.6 或以上</p>
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<pre class="chroma"><code class="language-bash" data-lang="bash">$ go version
</code></pre></td></tr></table>
</div>
</div><p><strong>1.2 安装 gRPC</strong></p>
<p>官方命令</p>
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<pre class="chroma"><code class="language-fallback" data-lang="fallback">$ go get -u google.golang.org/grpc
</code></pre></td></tr></table>
</div>
</div><p>结果是超时错误！！！<code>package google.golang.org/grpc: unrecognized import path &quot;google.golang.org/grpc&quot; (https fetch: Get https://google.golang.org/grpc?go-get=1: dial tcp 216.239.37.1:443: i/o timeout)</code></p>
<p>按规矩到 github 找  <code>https://github.com/google/grpc</code> 发现 <code>https://github.com/google/grpc</code> 有各种版本实现。于是：</p>
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<pre class="chroma"><code><span class="lnt">1
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<td class="lntd">
<pre class="chroma"><code class="language-fallback" data-lang="fallback">$ go get -d github.com/grpc/grpc-go
</code></pre></td></tr></table>
</div>
</div><p>下载完成后，需要将 <code>$GOPATH/src/github.com/grpc/grpc-go</code> 的内容复制到 <code>$GOPATH/src/google.golang.org/grpc</code></p>
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<pre class="chroma"><code class="language-fallback" data-lang="fallback">$ mkdir $GOPATH/src/google.golang.org/grpc -p
$ cp $GOPATH/src/github.com/grpc/grpc-go/* $GOPATH/src/google.golang.org/grpc -rf
$ go install google.golang.org/grpc/
</code></pre></td></tr></table>
</div>
</div><p>然而，在 install grpc 时一堆包找不到 &hellip; 包括：<code>github.com/golang/protobuf/...</code>,<code>golang.org/x/net/...</code>,<code>golang.org/x/sys/...</code>,<code>google.golang.org/genproto/...</code></p>
<p>然后，凡是 <code>golang.org</code> 上的包都需要从 <code>github.com/golang</code> 或 <code>github.com/google</code> 上下载。例如：</p>
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<td class="lntd">
<pre class="chroma"><code class="language-fallback" data-lang="fallback">$ go get -d github.com/golang/net
$ cp $GOPATH/src/github.com/golang/net $GOPATH/src/golang.org/x/net -rf
... 用同样方法下载 github.com/golang/sys 和 github.com/golang/text
$ go get -d github.com/golang/protobuf
$ go get -d github.com/google/go-genproto
$ cp $GOPATH/src/github.com/google/go-genproto/* $GOPATH/src/google.golang.org/genproto -rf
$ go install google.golang.org/grpc/
</code></pre></td></tr></table>
</div>
</div><p>总算安装完 go 版本的 grpc！</p>
<p><strong>1.3 安装 Protocol Buffers v3</strong></p>
<p>安装 protoc 编译器用于产生 gRPC 服务代码。最简单的方法是下载预编译的二进制版本（protoc-&lt;version&gt;-&lt;platform&gt;.zip）。下载地址：https://github.com/google/protobuf/releases。例如：</p>
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<pre class="chroma"><code class="language-fallback" data-lang="fallback">$ wget https://github.com/protocolbuffers/protobuf/releases/download/v3.6.1/protoc-3.6.1-linux-x86_64.zip
</code></pre></td></tr></table>
</div>
</div><ul>
<li>解压文件</li>
<li>修改环境变量 PATH 包含 protoc/bin 目录。</li>
</ul>
<p>最后，安装 protoc 的 go 插件</p>
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<pre class="chroma"><code><span class="lnt">1
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<pre class="chroma"><code class="language-fallback" data-lang="fallback">$ go get github.com/golang/protobuf/protoc-gen-go
</code></pre></td></tr></table>
</div>
</div><h3 id="2案例体验">2、案例体验</h3>
<p>进入产品的案例目录：</p>
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<pre class="chroma"><code class="language-fallback" data-lang="fallback">$ cd $GOPATH/src/google.golang.org/grpc/examples/helloworld
</code></pre></td></tr></table>
</div>
</div><p>这是一个已生成好的案例。 在 <code>helloworld</code> 有 <code>helloworld.proto</code> 接口定义文件 和 由它生成的 <code>helloworld.pb.go</code>。 <code>.pb.go</code> 包含：</p>
<ul>
<li>生成的客户端和服务器代码</li>
<li>消息序列化、反序列化等代码</li>
</ul>
<p><strong>试一试</strong></p>
<p>在终端运行服务器：</p>
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<pre class="chroma"><code class="language-fallback" data-lang="fallback">$ go run greeter_server/main.go
</code></pre></td></tr></table>
</div>
</div><p>在另一个终端运行:</p>
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<pre class="chroma"><code class="language-fallback" data-lang="fallback">$ go run greeter_client/main.go
2018/11/23 17:00:16 Greeting: Hello world
</code></pre></td></tr></table>
</div>
</div><h3 id="3-编写自己的-hello-world">3. 编写自己的 hello world</h3>
<p><strong>3.1 创建项目目录</strong></p>
<p>在自己的空间创建 helloworld 项目。并在项目下创建三个子目录：</p>
<ul>
<li>def 保存定义 与 protoc 生成的代码</li>
<li>server 服务器代码</li>
<li>client 客户端代码</li>
</ul>
<p><strong>3.2 编写接口定义文件</strong></p>
<p>在 def 下创建文件 <code>helloword.proto</code></p>
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<pre class="chroma"><code class="language-fallback" data-lang="fallback">// The greeting service definition.
syntax = &#34;proto3&#34;;

service Greeter {
  // Sends a greeting
  rpc SayHello (HelloRequest) returns (HelloReply) {};
  // Sends another greeting
  rpc SayHelloAgain (HelloRequest) returns (HelloReply) {}
}

// The request message containing the user&#39;s name.
message HelloRequest {
  string name = 1;
}

// The response message containing the greetings
message HelloReply {
  string message = 1;
}
</code></pre></td></tr></table>
</div>
</div><p>这是一个及其类似 c 语言的定义</p>
<h3 id="33-产生代码">3.3 产生代码</h3>
<p>在 helloworld 目录打开一个命令终端：</p>
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<pre class="chroma"><code><span class="lnt">1
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<pre class="chroma"><code class="language-fallback" data-lang="fallback">protoc -I def/ def/helloworld.proto --go_out=plugins=grpc:def
</code></pre></td></tr></table>
</div>
</div><p>正常就产生了 <code>helloworld.pb.go</code></p>
<h3 id="34-修改应用程序">3.4 修改应用程序</h3>
<p>拷贝原服务器 main.go 到 server 目录，修改：</p>
<ul>
<li><code>pb</code> 包别名为 <code>.pb.go</code> 所在的目录。例如：<code>github.com/.../grpc/helloworld/def</code></li>
<li>添加服务器实现代码</li>
</ul>
<div class="highlight"><div class="chroma">
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<pre class="chroma"><code class="language-go" data-lang="go"><span class="kd">func</span> <span class="p">(</span><span class="nx">s</span> <span class="o">*</span><span class="nx">server</span><span class="p">)</span> <span class="nf">SayHelloAgain</span><span class="p">(</span><span class="nx">ctx</span> <span class="nx">context</span><span class="p">.</span><span class="nx">Context</span><span class="p">,</span> <span class="nx">in</span> <span class="o">*</span><span class="nx">pb</span><span class="p">.</span><span class="nx">HelloRequest</span><span class="p">)</span> <span class="p">(</span><span class="o">*</span><span class="nx">pb</span><span class="p">.</span><span class="nx">HelloReply</span><span class="p">,</span> <span class="kt">error</span><span class="p">)</span> <span class="p">{</span>
	<span class="k">return</span> <span class="o">&amp;</span><span class="nx">pb</span><span class="p">.</span><span class="nx">HelloReply</span><span class="p">{</span><span class="nx">Message</span><span class="p">:</span> <span class="s">&#34;Hello again &#34;</span> <span class="o">+</span> <span class="nx">in</span><span class="p">.</span><span class="nx">Name</span><span class="p">},</span> <span class="kc">nil</span>
<span class="p">}</span>
</code></pre></td></tr></table>
</div>
</div><p>实现 GreeterServer 接口。</p>
<p>拷贝原客户端 main.go 到 client 目录，修改：</p>
<ul>
<li><code>pb</code> 包别名为 <code>.pb.go</code> 所在的目录。例如：<code>github.com/.../grpc/helloworld/def</code></li>
<li>添加客户端调用代码</li>
</ul>
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<td class="lntd">
<pre class="chroma"><code class="language-go" data-lang="go">	<span class="nx">r</span><span class="p">,</span> <span class="nx">err</span> <span class="p">=</span> <span class="nx">c</span><span class="p">.</span><span class="nf">SayHelloAgain</span><span class="p">(</span><span class="nx">ctx</span><span class="p">,</span> <span class="o">&amp;</span><span class="nx">pb</span><span class="p">.</span><span class="nx">HelloRequest</span><span class="p">{</span><span class="nx">Name</span><span class="p">:</span> <span class="nx">name</span><span class="p">})</span>
	<span class="k">if</span> <span class="nx">err</span> <span class="o">!=</span> <span class="kc">nil</span> <span class="p">{</span>
		<span class="nx">log</span><span class="p">.</span><span class="nf">Fatalf</span><span class="p">(</span><span class="s">&#34;could not greet: %v&#34;</span><span class="p">,</span> <span class="nx">err</span><span class="p">)</span>
	<span class="p">}</span>
	<span class="nx">log</span><span class="p">.</span><span class="nf">Printf</span><span class="p">(</span><span class="s">&#34;Greeting: %s&#34;</span><span class="p">,</span> <span class="nx">r</span><span class="p">.</span><span class="nx">Message</span><span class="p">)</span>
</code></pre></td></tr></table>
</div>
</div><p>运行服务器：</p>
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<pre class="chroma"><code class="language-fallback" data-lang="fallback">$ go run server/main.go
</code></pre></td></tr></table>
</div>
</div><p>运行客户端：</p>
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</span></code></pre></td>
<td class="lntd">
<pre class="chroma"><code class="language-fallback" data-lang="fallback">$ go run client/main.go
2018/11/23 18:25:54 Greeting: Hello world
2018/11/23 18:25:54 Greeting: Hello again world
</code></pre></td></tr></table>
</div>
</div><p>项目源代码地址： <a href="https://github.com/pmlpml/golang-learning/tree/master/services/grpc/helloworld">https://github.com/pmlpml/golang-learning/tree/master/services/grpc/helloworld</a></p>

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